Land in Japan and you'll want data in your pocket — for Google Maps, translating menus, and checking the latest on the fly. Picture being lost in Shinjuku Station with no signal. We compare all three options in full — price, pros, cons — plus a step-by-step on setting up an eSIM before you fly.
Straight up: data is as essential to a Japan trip as your passport. Picture standing baffled in front of a Tokyo subway map with a dozen lines, hungry but unable to read a kanji menu, or wanting to check whether the shop you're heading to is still open — every one of those needs the internet, whether it's Google Maps for navigation, a translation app, or LINE to message friends, right down to scanning a QR code to pay. Japan has 4G/5G coverage across nearly 100% of the areas tourists visit; you just need to pick the right way to connect.
Travellers have three main options — an eSIM (a digital SIM you install before you fly), Pocket WiFi (a portable hotspot device), and a physical SIM you slot into your phone. This page lays out exactly what each one costs, the pros and cons, who it suits best, then walks you through setting up an eSIM step by step until it's working for real.
Scroll the table sideways to see every column — prices are rough ranges for a trip of about 7–10 days (based on popular 2026 providers). Each provider prices differently by data amount and number of days, so check the latest before you buy.
| Option | Rough price | Pros | Cons | Best for |
|---|---|---|---|---|
| eSIMDigital SIM | ~฿500–900 (10GB–unlimited / 7–10 days) | Install before you fly, no device to carry, nothing to return, cheapest per head | Phone must support eSIM + be unlocked · usually no phone number | Solo/couple travellers with newer phones |
| Pocket WiFiPortable router | ~฿1,700–2,800 (rented for the whole 7–10 day trip) | Connects several devices at once, shared by the whole group, works with any phone | Carry it and charge it daily · pick up and return the unit · deposit required | Groups of friends or families |
| Physical SIMPhysical SIM | ~฿500–1,000 (by days/data) | Works with phones that don't support eSIM, buyable at Japanese airports | Phone must be unlocked · remove and store your home SIM · easy to lose | Older phones that don't support eSIM |
It sounds technical, but it really only takes a few minutes. Follow these six steps while you're still at home (and still on WiFi), and you'll have data the second you step off the plane in Japan — no queueing for a SIM at the airport.
Every iPhone from the XR/XS (2018) supports it · on Android, phones like the Samsung Galaxy S20+ and Pixel 4+ do too. The quick check: dial *#06# — if there's a 32-digit EID, you're good. The phone also has to be carrier-unlocked.
Pick an eSIM provider and buy a Japan package for the number of days and the amount of data you want. Pay online before you even fly. Prices start in the low hundreds of baht — choose a daily 1–2GB plan or go unlimited.
After paying you'll get a QR code by email. Open it on another screen and scan it with your phone's camera (or enter the code by hand) and your phone adds the eSIM profile — doing this while still on home WiFi is smoothest.
Go to Settings → Cellular/Mobile Data and turn on data roaming for the eSIM only (not your home SIM, to avoid pricey roaming). Some providers want you to set an APN as the email describes — just follow it line by line.
Most packages start counting the days from your first connection to a Japanese network, not when you scan the QR. When you land and switch your phone on, pick a Japanese network (DOCOMO/KDDI/SoftBank) and data springs to life on its own.
Leave your home SIM's data roaming off the whole time so you never get hit with steep charges, but you can keep receiving calls on it (calls/SMS still come in) while you use data from the eSIM — both SIMs work at once.
The most-asked question is "how many GB should I buy?" — and the answer depends on how you use your phone. Read these three tiers and you can size yourself up right away.
If you mostly just navigate with Google Maps, chat on LINE, and check email with a bit of social scrolling, around 1GB a day is more than enough. A 7-day trip is comfortable on a 7–10GB package, and you'll save a fair bit.
If you love to watch clips, stream music, video-call, or post photos and videos to IG/TikTok often, allow 2–3GB a day — or just go for an unlimited package and stop worrying about running out.
Most unlimited packages give full speed for the first 1–2GB each day and then throttle the speed (still fine for chat and maps, but clips won't play smoothly). If you want full speed all day, look for a package that says "no speed throttling" — which costs more.
Tuck these away and your trip won't have a dead-signal moment when you need data most — especially when you're lost or scrambling to find your way.
The 4G/5G networks of DOCOMO/KDDI/SoftBank reach nearly every area tourists visit — Tokyo, Osaka, Kyoto, Sapporo, Fukuoka. Both eSIMs and Pocket WiFi run on these same networks.
It comes down to how many of you are travelling and what phone you carry — read these four cases and the choice makes itself.
Visa · eSIM · IC card · JR Pass · yen · power plugs · etiquette — everything to sort before you fly, in one place.
Travel Prep →Ship your bags hotel-to-hotel with takkyubin and use station coin lockers — explore light without dragging a suitcase.
Luggage Guide →Estimate accommodation, food, and transport per day — data included — and get a number before you plan the trip.
Budget Calculator →Shoes off, no tipping, quiet on the train, sorting your rubbish — how to carry yourself without feeling awkward in Japan.
Japanese Etiquette →Just this handful gets you through — greetings, ordering food, asking directions, shopping, and emergencies.
Survival Phrases →Every region and city, with links into city guides, hotels, and attractions across Japan.
Japan Guide →Set up an eSIM or reserve Pocket WiFi while you're still at home, then open the full prep guide — visa, JR Pass, yen, everything before you fly — and line up a well-placed hotel ahead of time.